# FlexSpec Backpack vs Astro Track

The clearest difference is update cadence: FlexSpec Backpack at every 24 months against Astro Track's every 56 months. FlexSpec Backpack also leads on iOS requirement (9.3 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

FlexSpec Backpack ships an update every 24 months, Astro Track every 56 months. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | FlexSpec Backpack | Astro Track |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 24 months** | Every 56 months |
| Monetization | — | Free |
| Size | 140 MB | 14 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bubble Technology Industries](https://appshunter.io/developer/1235174582) | [Aminjoni Abdullozoda](https://appshunter.io/developer/1508893057) |

## What reviewers say

### FlexSpec Backpack

[App page](https://appshunter.io/ios/app/flexspec-backpack/id1235174583)

**Features:** macOS Compatibility

**In-app purchases:** none


### Astro Track

[App page](https://appshunter.io/ios/app/astro-track/id1442268016)

Track the International Space Station's live location on a map. Get real-time updates and see its path across the globe. A must-have for space enthusiasts and anyone curious about our planet from above.

**Highlights:** Live ISS tracking on map, Real-time location updates, Global path visualization, Space station information

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FlexSpec Backpack free?

FlexSpec Backpack is free to download, with no in-app purchases.

### Is Astro Track free?

Astro Track is free to download, with no in-app purchases.

### Do FlexSpec Backpack or Astro Track have ads?

Neither FlexSpec Backpack nor Astro Track shows ads.

### Which is updated more often, FlexSpec Backpack or Astro Track?

FlexSpec Backpack ships an update every 24 months, and Astro Track every 56 months. Most recently, FlexSpec Backpack was updated on October 14, 2026 and Astro Track on October 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*